FULL PRODUCT VERSION :
1.5.0_16
1.6.0_07

ADDITIONAL OS VERSION INFORMATION :
Windows XP service pack 3

A DESCRIPTION OF THE PROBLEM :
Last line of the following code:
String host;
int port;
JMXServiceURL url = new JMXServiceURL("jmxmp", host, port);
JMXConnector connector = JMXConnectorFactory.connect(url);
MBeanServerConnection beanServerConnection = connector.getMBeanServerConnection();
throws java.lang.IllegalArgumentException: javax.management. remote.JMXConnectorProvider: : java.io.FileNotFoundException: C:\Documents and Settings\Serge (Access is denied)
when launched in any folder, containing "!" in its name.
In my case it was C:\Documents and Settings\Serge\!knowledgeBase.
At the same time, it works fine in any folder without "!" in its name.

I assume, java treats "!" in URL as beginning of jar entry and tries to open jar, which is in fact folder.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and run (requires jmxremote_optional.jar) 'Bug.java' provided below

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Expected connection top be established
ACTUAL -
Exception in console, with the root cause
java.io.FileNotFoundException: C:\Documents and Settings\Serge (Access is denied)

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.lang.IllegalArgumentException: javax.management.
remote.JMXConnectorProvider: : java.io.FileNotFoundException: C:\Documents and Settings\Serge (Access is denied)
        at com.sun.jmx.remote.util.Service.fail(Service.java:129)
        at com.sun.jmx.remote.util.Service.parse(Service.java:208)
        at com.sun.jmx.remote.util.Service.access$100(Service.java:111)
        at com.sun.jmx.remote.util.Service$LazyIterator.hasNext(Service.java:257)
        at javax.management.remote.JMXConnectorFactory.getConnectorAsService(JMXConnectorFactory.java:424)
        at javax.management.remote.JMXConnectorFactory.newJMXConnector(JMXConnectorFactory.java:310)
        at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:247)
        at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:207)
        at Bug.main(Bug.java:11)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
//Bug.java
//requires jmxremote.jar @ compile time
//requires jmxremote_optional.jar @ runtime

import javax.management.*;
import javax.management.remote.*;

public class Bug {

  public static void main(String args[])
    throws Exception {

    MBeanServerConnection beanServerConnection = null;
    JMXServiceURL url = new JMXServiceURL("jmxmp", "localhost", 55000);
    JMXConnector connector = JMXConnectorFactory.connect(url);
    beanServerConnection = connector.getMBeanServerConnection();
  }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Remove "!" from folder name